This is my new Math in A Box. I'm posting math lessons-examples/diagrams-for algebra geometry, trig, precalculus. Need help? Make requests as I have hundreds! Hopefully I can post enough to help parents new (or not) to homeshooling during the pandemic.

Find the length of a rectangle whose perimeter is 40 feet. The length is 2 more than 5 times the width. What is the length if we let the width be w? Then the length is 2 more than 5 times w. That is 2 +5w or 5w + 2. The perimeter is 2 widths added to 2 lengths: P = w+ w+ 5w+2 + 5w+2 We know P is 40. SEE that in the stated problem above.